6551866 has 4 divisors (see below), whose sum is σ = 9827802. Its totient is φ = 3275932.

The previous prime is 6551861. The next prime is 6551879. The reversal of 6551866 is 6681556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6395841 + 156025 = 2529^2 + 395^2 .

It is not an unprimeable number, because it can be changed into a prime (6551861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1637965 + ... + 1637968.

Almost surely, 2^6551866 is an apocalyptic number.

6551866 is a deficient number, since it is larger than the sum of its proper divisors (3275936).

6551866 is a wasteful number, since it uses less digits than its factorization.

6551866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3275935.

The product of its digits is 43200, while the sum is 37.

The square root of 6551866 is about 2559.6613057200. The cubic root of 6551866 is about 187.1206290803.

The spelling of 6551866 in words is "six million, five hundred fifty-one thousand, eight hundred sixty-six".